As a whole , efficiency of the chaotic mixing of shear - thinning fluids is worse than of newtonian fluids , but there are different reasons in the two - dimensional and the three - dimensional chaotic mixing in eham 總體上偏心螺旋環(huán)流混合器中剪切變稀流體的混合效果不如牛頓流體,但是在二維和三維混沌混合中有不同的原因。
Then the author proposed a quantitative method to investigate three - dimensional chaotic mixing and did the comparative studies of three - dimensional chaotic mixing in eham among newtonian fluids , viscoelastic fluids and shear - thinning fluids 其中,提出定量表征三維eham總體混合效果的方法,并對牛頓流體、粘彈性流體和剪切變稀流體的混合效果進行了比較。
For newtonian fluid , the influence of the plate undulations , the reynolds number and the thickness of the film are shown by parameter studies ; for non - newtonian fluid , the shear - thinning coefficient on the film flow is shown by parameter studies 在薄膜流動過程中,考慮波形板的輪廓形狀參數(shù)變化、流動中雷諾數(shù)的大小、薄膜厚度的變化以及非牛頓流體的剪切變稀系數(shù)對薄膜流動的流變特性影響。
The main contributions of the dissertation are as follows : on the basis of experimental results , the operational effects , such as the magnitude of magnetic field , the temperature and the rate of shear strain , on the shear stress of the mr fluid are shown and models of the quasi - bingham model and a nonlinear model for the shear stress of the mr fluid also are developed , in which the characteristic of " shear - thin " of the mr fluid is described 論文的主要貢獻如下:通過測試磁流變液剪切應力與磁感強度、剪切應變速率、溫度的變化規(guī)律,建立了能反映磁流變液剪切變稀現(xiàn)象的剪切應力與剪切應變速率的磁流變液模型。根據(jù)磁流變液模型,從理論上建立了能在較寬的電壓內(nèi)范圍比較準確地預報磁流變阻尼器輸出力的近似公式。
For both newtonian flow and non - newtonian flow , the vortices are generated when the waviness of the bottom profile is beyond a critical number . by increasing the waviness , a second vortex can be generated . with the increasing of reynolds number , the symmetry of the streamlines at re = 0 is destroyed and the vortices are sloped and become larger 當波形板的波動度超出臨界值,波形板壁面上的流動出現(xiàn)流線分離,流動中有渦生成;增大波動度,流動中出現(xiàn)第二個渦; re = 0 ,流線在流場中對稱分布;雷諾數(shù)增大,流線駐點在水平方向出現(xiàn)位置偏移,渦的范圍增大;對于非牛頓流體,隨著剪切變稀指數(shù)的減小,渦的作用范圍減小。